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Induction motor and sequence reactance 
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#1
Jun2214, 10:06 AM

P: 9

Hello! This is my second post about sequence reactances. This time its in induction motor.
To my understanding ( once again )  In any network (symmetrical or unsymmetrical) , there would be 3 components positive sequence component, negative sequence component and zero sequence component. Question: In induction motors, what do the: running reactance, starter reactance and standstill reactance mean? and, Do any one of them signify/mean the positive sequence reactance of a unsymmetrical fault system? 


#2
Jun2214, 10:07 AM

P: 9

BTW, a prompt reply is very much appreciated. Please and thank you!



#3
Jun2414, 08:40 AM

P: 53

According to IEC 609090 Ch. 3.8 Asynchronous motors 3.8.1 General:
The impedance ZM = R M + jXM of asynchronous motors in the positive and negativesequence systems can be determined by: ZM=1/(ILR/IrM)*UrM/sqrt(3)/IrM=UrM^2/SrM//(ILR/IrM) Where UrM is the rated voltage of the motor; IrM is the rated current of the motor; SrM is the rated apparent power of the motor (SrM = PrM/(effrM* COSfiTM); PrM is the rated motor power [kW] effrM is the rated motor efficiency COSfiTM is the rated motor power factor ILR/IrM is the ratio of the lockedrotor current to the rated current of the motor. 


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